Instead of a loop, just a simple line.
It helps to create small details in smaller parts vs utilizing a loop and trying to trick it with non-existent lead-ins and more. On top of dealing with the smallest bridges that may break off easily.
In this example, I used a nozzle with a large kerf width for the thickest line cutting possible.
You can see it adds quite a bit of detail.
Them’s fighting words! Where do you come off using such language on the forum. 
Either you have had some anatomy or injured yourself. I am impressed as most people would have said “top of the shoulder.”
I spent most of my college days learning the human body and then the rest of my days working where I learned to use more “common place” terms for body parts. I worked with someone that always used the technical terms for everything and would explain the nerve root innervation of each muscle and the muscle technical name. He thought it made him sound smarter, I thought it made he seem elitist. Even the nurses would ask him to explain what he was talking about. He would always smile but then they stopped asking. Oh well, water under the bridge once you retire!
Sorry @TomWS …but, this is the longest that I have ever stayed on topic!!! (Tom is my little conscience reminding me that I have strayed off the topic. I need that sometimes.)
Back on topic:
If you are using Fusion 360 to CAM this, you will likely need to use a separate tool path for the single lines of the ribs. If you are using SheetCAM from the DXF file, it will probably get them just fine. Just make sure you look at the final results to see that manufacturing picked them up.
I say, if OP is Happy then you get a bye. 
Plus you’ve given Limit Switch Man (AKA @Bigdaddy2166 ) some new words. That’s always a good thing.
supercalifragilisticexpialidocious. = extraordinarily per Tom, which he is.
Oddly enough, we watched Mary Poppins the last time my Granddaughter visited. Great fun!
